Textile drafting apparatus



Nov. 7, 1967 P. GlUlUZZA TEXTILE DRAFTING APPARATUS 2 Sheets-Sheet 1 Filed July 15, 1964 Q n M? T 0/ u J I 7 W 1 m 7 Q A a, Y B

Nov. 7, 1967 Filed July 15, 1964 2 Sheets-Sheet 2 INVENTOR. fig/ GiuL uzuzQ P. GIUIUZZA 3,350,870

TEXTILE DRAFTING APPARATUS United States Patent 3,350,870 TEXTILE DRAFTING APPARATUS Pietro Giuiuzza, Milan, Italy, assignor to Oflicine Meccaniche Cigardi S.p.A.-0.M.C.S.A., Milan, Italy, a corporation of Italy Filed .Iuly 15, 1964, Ser. No. 382,752 Claims priority, application Italy, July 18, 1963,

,960/ 63 3 Claims. (Cl. 57-774) This invention generally relates to the spinning and drafting of textile filamentary material and, more particularly, it is concerned with a new and improved drafting apparatus for suitably drawing a filamentary roving, such as formed by a carded wool and cotton fiber mix, into a thread, the new apparatus of the invention being generally designed to be operated in continuous spinning frames, such as a ring frame, or like textile machine.

A principal object of this invention is to provide a new and advantageous drafting apparatus wherein drafting means including a plurality of drawing rolls for progressing and drafting a roving therebetween are combined with false twisting means arranged to impart to said roving a false twist at a portion thereof where the filamentary material is also subject to drafting, whereby said drafting is performed surprisingly more eificiently than heretofore feasible.

More particularly, it is an object of this invention to provide a roving drafting apparatus with a new and improved false twisting device including positively driven rotating members arranged to tangentially contact the progressing roving as said roving is subject to a substantial draft, the contact being such provided that the frictional engagement of said member with said roving will cause the latter to be rotated about its axis while the progression and the development of the draft is not noticeably prejudiced.

A further object of this invention is to provide a new arrangement of a false twisting device in a roving drawing apparatus wherein a drafting interval is defined between two spaced pairs of drafting rolls, said device being positioned to act on and irnpart a rotation to said roving at a location near to the outlet pair of said pairs, whereby both a drafting action and a false twisting action are concurrently applied to said roving in the same interval.

A still further object of this invention is to provide a new device for imparting a false twist to a roving or multifiber material progressed along a drafting apparatus and while subject to a drafting action, said device comprising a stationary structure having two spaced parts and a recess for passage of said roving between said parts, and two essentially coplanar pulleys supported for rotation in one and respectively in other of said parts, said pulleys having arc portions protruding in said recess and defining therebetween a space wherein said roving is caused to contact both said pulleys while progressed in said recess, said pulleys being driven for rotation in same direction so that said roving, as frictionally engaging both said pulleys, is caused to rotate about its axis.

Another object of this invention is to provide a new and improved false twisting device as above, wherein said pulleys are supported by said stationary structure so that a precise adjustment of the space defined therebetween may be provided for adaptation of the device to operate on rovings of dilfering diameters, and to provide a frictional engagement with said roving, adapted for causing said roving to rotate while the progression of the drafting action upstream of said device is not prevented. In this connection, is to be taken in mind that commonly produced 3,350,870 Patented Nov. 7, 1967 false twisting devices, including stationary members in sliding contacting relationship with the roving (such as a needle, an hook and so on) do not admit the progressing of a stretching or drafting action from downstream to upstream of the device, so that, by applying current art, concurrent application of both drafting and twisting on same portion of a roving or thread is not feasible.

These and other objects and advantages of the invention will be made apparent as this description proceeds, and the features which are believed as new and characteristic of the invention will be defined in the appended claims. The invention itself, however, both as to its construction and its mode of operation, will be best understood from the following detailed description of a preferred embodiment thereof, taken in conjunction with the accompanying drawings, forming an essential component of this disclosure, and wherein:

FIGURE 1 diagrammatically shows, partly in side elevation and partly in sectional view, the novel arrangement of the invention, wherein a false twisting device of type considered is combined with an essentially conventional drafting apparatus, forming part of a spinning frame (not shown), the components critically combined and arranged according to the invention being shown more markedly than the conventional structure of said apparatus;

FIGURE 2 detailedly illustrates the false twisting device, partly in front view and prevailingly in sectional elevation taken on line 2-2 in FIGURE 3 wherein a cross-sectional view on line 3--3 of FIG. 2 of same device is shown.

Referring now to the drawings, wherein like reference letters and numerals refer to like parts and elements throughout the several figures.

As shown in FIG. 1, the improved apparatus embodies a drafting unit including three superimposed and spaced drafting cylinders 14), 11 and 12, conventionally constructed and driven, and cooperating with rolls suitably supported for rotation on a pivotal arm 20 to form a corresponding number of pairs of drafting rolls defining a first and a second drafting interval C and respectively C" therebetween, according to current art.

Further according to current art, the said upper or first cylinder 10 and its cooperating roll are movably secured to the structure of the spinning frame and of arm 20, respectively, for adjustment of the length of first drawting interval C. In addition, while it is believed that the present invention is such to lead to a particular utility and advantage if embodied in a draft ing apparatus having three pairs of drafting rolls, i.e. designed to impart to the roving a two step draft or drawing, the invention may however usefully applied for improving drafting apparatuses including less or more than three pairs of rolls and/or providing a total draft in more or less than two successive steps. Therefore the number of the drafting steps is not critical of the invention.

The newly constructed and arranged false twisting device' is generally indicated at D and positioned in the apparatus to act on a roving S conventionally progressed in direction A through said pairs or rolls including cylinders 10,11 and 12 as their components, and while said roving S is subject to a substantial draft in the interval C between the first and the second pair of rolls, so that the roving S is caused to be twisted in its portion corresponding to interval Ft, defined between the elements 14 contacting said roving and the upstream pair of rolls including cylinder 1t From FIG. 1 it is apparent that such false twist interval Ft overlaps the greatest part of the first drafting interval C and, therefore, that in such interval Ft the roving S will be subject both to a drafting and to a reliable twist, provided that the construction and the operation of said false twisting action does not bar or noticeably disturb the progressing upward of the draft, i.e. does not confine the draft in the interval defined between the location at which the twisting element or elements contact the roving and the adjacent downstream drafting pair of rolls, as conventionally produced false twisting devices do.

Said twisting elements 14 consist of essentially coplanar pulleys which are concurrently rotated in same direction, such as in direction R of FIG. 3, by a belt 15, driven by a driving pulley such as at 16 and revolving about idle pulleys such as at 1'7 and 18. As the device D is designed to be associated to any drafting apparatus of a conventional spinning frame (not shown) provided with a plurality of said apparatuses conventionally aligned and arranged in the front of the frame, each driving pulley such as at 16 may be conveniently supported on and rotated by a common shaft 19 supported for rotation In the frame rearwardly of the said apparatuses and conventionally connected for rotation to the drive means of the frame.

The said device D is preferably constructed as shown in FIGS. 2 and 3. Said twisting elements consists of pulley forming portions of members 21 rotatably sup-ported about the lower end portion of shafts 22 and respectively 23 (FIG. 2). The upper end portion of said shafts is secured to parallel and spaced portions 24 and respectively 25 of a stationary member 26 which embodies the stationary structure of the device. A recess 27 is formed between said portions 24 and 25 for passage of roving S, as particularly shown in FIG. 3.

Said pulley forming portions of members 21 are grooved and rings 28 and 29 are seated in the grooves to embody the periphery of each pulley, whereat said pulleys contact the roving S progressed in said recess 27. As shown in FIG. 3, said pulleys are arranged to inwardly protrude in said recess and spaced for contacting the roving and for slightly frictionally engaging thereon so that the rotation on both said pulleys in direction R will positively apply a torque to the roving S and cause the desired twist thereon. The pulley forming portions of members 21 and the rings 28 and 29 form therefore a pair of rollers forming a narrow gap therebetween in which a roving is adapted to move in direction parallel to the axes of the rollers and contacted at opposite sides thereof by peripheral surfaces of the rollers.

Said roving contacting rings 28 and 29 are preferably made of rubbery material, such as natural or synthetic rubber, to provide a roving contacting surface adapted for tangential engagement and frictional adherence to cause the rotation of the roving, while a very low pressure is applied thereto so that the lengthwise progression and drafting of the fibrous material would not be prejudiced by the arrangement of the twisting device. The same members 21 are further provided with other grooves 30 for engagement with the above described driving belt 15.

The device is further provided with adjusting means for adjusting the space between the two rotary twisting members or elements 14. For example, as shown in FIG. 2, the shaft 22 of the rotary element 14 at right is fixedly secured to part 24 of stationary member 26 by a set-screw 31. The shaft 23 of the rotary element at left is supported in said part 25 for oscillation about a pivot pin 32 and its portion relatively to the other rotary element may be precisely adjusted upon adversedly driving adjusting screws 33 and 34 located above and respectively below said pivot pin for tilting said shaft 23 about the axis defined by said pin and securing the members at the desired adjusted position and spacing of the twisting rotary members.

The device D may be supported in any suitable manner. For example, it may be secured to a longitudinal member such as at 35 appertaining to the framing of the spinning frame, by means of a couple of pegs or pins such as indicated at 36, secured to stationary structure member 26 of the device and slidably fitting into matching bores; 37 provided in said longitudinal member 35. In the ar rangement shown in FIG. 1, the tension of driving belt 15 may be made use of for maintaining the device D adjacent to said stationary longitudinal member 35.

The provision of a tapered protrusion as shown at 38 in FIG. 3 prevents undesirable ejection of roving S from recess 27, if said roving, such as the apparatus is started, would be contacted by the left rotary member only, which tends to outwardly displace the roving upon its rotation in direction R. Such tapered jutting part 38 causes the displaced roving to be spaced from the periphery of the pulley well before the ejection of rovlng from recess 27 will occur.

It has been surprisingly found that the provision and the operation of a twisting device of the general character described above, comprising concurrently rotating rotary members arranged for tangentially frictionally engaging a roving progressed therebetween, may provide a sub stantial amount of false twist to said roving without disturbance of the development of a substantial stretching and drafting applied between drafting roll means located upstream and respectively downstream of the location at which said rotary members contact said roving, so that said twist may occur on a portion of roving, corresponding to interval Ft of FIG. 1, wherein a drafting action 1s also effectively applied to same roving.

It has been further found that such concurrency of draft and of positively applied false twist noticeably improves the thread processed in the new apparatus. It has been also found that such concurrent draft and false twist, as applied to the first step or field of draft, as occurring in interval C of FIG. 1, substantially improves the ability of the partially drawn roving to resist it and taking advantage of unexpectedly high drafting ratios in one or more successive steps or fields of draft, such as applied in inter nal C" of FIG. 1.

It is therefore believed to be evident that the present invention includes various advantageous features, and it will be understood too that each of the new features de scribed and any combination thereof may also find a use ful application in other types of spinning and drafting machines or apparatus differing from the one described.

Without further analysis the foregoing will so fully re veal the gist of this invention that others can, by applying current knowledge, readily adapt it for various applicw tions without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of this invention and, therefore, such adaptations should and are intended to be comprehended within the spirit and meaning of equivalents of the invention, as defined in and by the appended claims.

Having thus described the invention and the mode of making use thereof, what is claimed as new and desired to be protected by Letters Patent is:

1. A false twisting device for use in combination with a drafting apparatus, said false twisting device comprising a pair of rollers turnably about substantially parallel axes so that the peripheral surface of said rollers define a narrow gap in which a roving is adapted to move in direction parallel to said axes contacted at opposite sides thereof by said peripheral surfaces; drive means cooperating with said rollers for rotating the latter in the same direction about the axes thereof; support means for supporting said pair of rollers turnably about said axes and at least one roller adjustable for changing the width of said gap, said support means including a pair of axles, a stationary member mounting each roller in the region of one end of the respective axle turnably about the latter while preventing said roller from shifting in axial direction, means securing one of said axles in the region of the other end thereof in fixed position to said stationary- 5 member, means mounting the other of said axles tiltable about a tilting axis adjacent the other end of said other axle, and a pair of adjustable means engaging said other axle at points spaced from and to opposite sides of said tilting axis to adjust the inclination of said other axle and thereby the width of said gap.

2. A false twisting device as defined in claim 1 wherein said adjusting means are arranged spaced in longitudinal direction of said other axle to opposite sides of the tilting axis thereof.

3. A false twisting device as defined in claim 1, wherein said adjustnig means are in the form of a pair of set screws.

6 References Cited UNITED STATES PATENTS 3,182,439 5/1965 Gori 5777.4 X

FOREIGN PATENTS; 59,721 6/ 1913 Austria. 640,194 4/1962 Canada. 515,672 3/ 1938 Great Britain. 912,832 12/1962 Great Britain.

MERVIN STEIN, Primary Examiner. D. NEWTON, Assistant Examiner. 

1. A FALSE TWISTING DEVICE FOR USE IN COMBINATION WITH A DRAFTING APPARATUS, SAID FALSE TWISTING DEVICE COMPRISING A PAIR OF ROLLERS TURNABLY ABOUT SUBSTANTIALLY PARALLEL AXES SO THAT THE PERIPHERAL SURFACE OF SAID ROLLERS DEFINE A NARROW GAP IN WHICH A ROVING IS ADAPTED TO MOVE IN DIRECTION PARALLEL TO SAID AXES CONTACTED AT OPPOSITE SIDES THEREOF BY SAID PERIPHERAL SURFACES; DRIVE MEANS COOPERATING WITH SAID ROLLERS FOR ROTATING THE LATTER IN THE SAME DIRECTION ABOUT THE AXES THEREOF; SUPPORT MEANS FOR SUPPORTING SAID PAIR OF ROLLERS TURNABLY ABOUT SAID AXES AND AT LEAST ONE ROLLER ADJUSTABLE FOR CHANGING THE WIDTH OF SAID GAP, SAID SUPPORT MEANS INCLUDING A PAIR OF AXLES, A STATIONARY MEMBER MOUNTING EACH ROLLER IN THE REGION OF ONE END OF THE RESPECTIVE AXLE TURNABLY ABOUT THE LATTER WHILE PREVENTING SAID ROLLER FROM SHIFTING IN AXIAL DIRECTION, MEANS SECURING ONE OF SAID AXLES IN THE REGION OF THE OTHER END THEREOF IN FIXED POSITION TO SAID STATIONARY MEMBER, MEANS MOUNTING THE OTHER OF SAID AXLES TILTABLE ABOUT A TILTING AXIS ADJACENT THE OTHER END OF SAID OTHER AXLE, AND A PAIR OF ADJUSTABLE MEANS ENGAGING SAID OTHER AXLE AT POINTS SPACED FROM AND TO OPPOSITE SIDES OF SAID TILTING AXIS TO ADJUST THE INCLINATION OF SAID OTHER AXLE AND THEREBY THE WIDTH OF SAID GAP. 